Two-species synthetic microbial community (the BsBv SynCom) of Bacillus safensis and Bacillus velezensis, screened for high extracellular cellulase, amylase and protease activities and applied to cigar tobacco leaves (cultivar QX204) during a 42-day fermentation. The consortium accelerated degradation of cellulose, protein, and starch, shifted the leaf bacterial community toward Firmicutes/Bacillus, and modulated the volatile flavor metabolite profile (e.g. phenylacetic acid, phytol, farnesol) to enhance honey, floral, and baked aromas while reducing irritancy, thereby directionally improving cigar tobacco leaf quality.
Taxonomy
| Taxon | Ontology ID | Functional Roles | Abundance |
|---|---|---|---|
| Bacillus safensis | NCBITaxon:561879 · TaxonMech · TraitMech |
PRIMARY_DEGRADER
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N/A |
|
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| Bacillus velezensis | NCBITaxon:492670 · TaxonMech · TraitMech |
PRIMARY_DEGRADER
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N/A |
|
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Ecological Interactions
The graph shows only explicitly linked interaction participants. Community members without an asserted participant link are omitted; membership alone does not imply an interaction.
Macromolecule degradation after BsBv inoculation
BsBv inoculation accelerated cellulose, protein and starch loss during the tested leaf fermentation, with reductions of 52.48%, 56.36% and 68.47%, respectively, greater than the uninoculated control. This is a measured consortium-associated process outcome; it does not establish that both bacterial partners benefit or that the mixture exceeds each monoculture.
Biological Processes:
- cellulose catabolic process (GO:0030245 · PathwayMech)
- starch catabolic process (GO:0005983 · PathwayMech)
- protein catabolic process (GO:0030163 · PathwayMech)
HYPOTHESIZED/PARTIAL: macromolecule conversion is proposed to contribute to the altered chemical and sensory outcomes under BsBv inoculation. The abstract reports chemical changes and a path-model interpretation, but does not isolate degradation of any one substrate as the mediator of a specific volatile or sensory change.
Evidence
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doi:10.1016/j.indcrop.2025.122621 - SUPPORT (IN_VITRO)"The SynCom significantly accelerated the degradation of key macromolecules, reducing cellulose, protein, and starch contents by 52.48 %, 56.36 %, and 68.47 %, respectively, which were markedly greater reductions than those observed in the uninoculated control."
SynCom-driven bacterial community succession and Bacillus enrichment
BsBv inoculation shifted bacterial community structure, including greater relative abundance of Firmicutes and enrichment of Bacillus. The authors also used PLS-PM to infer a microbiome-mediated contribution to sensory quality. Relative abundance and modeled mediation do not establish absolute population increases, niche separation or a Bacillus-specific causal mechanism.
HYPOTHESIZED/PARTIAL: community restructuring is proposed to contribute to the sensory component of the BsBv-associated outcome, consistent with the authors beta-diversity path-model interpretation. This does not identify Bacillus enrichment as the necessary mediator of each volatile change, or equate relative-abundance shifts with the modeled beta-diversity variable.
Evidence
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doi:10.1016/j.indcrop.2025.122621 - SUPPORT (IN_VITRO)"inoculation shifted the bacterial community structure, increasing the relative abundance of Firmicutes and significantly enriching the genus Bacillus."
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doi:10.1016/j.indcrop.2025.122621 - PARTIAL (COMPUTATIONAL)"indirectly improved sensory quality by mediating shifts in microbial β-diversity"
Volatile flavor and sensory-quality outcomes
Metabolomics identified 31 differentially accumulated volatile compounds after BsBv inoculation. The source associates increased phenylacetic acid, phytol and farnesol with honey, floral and baked aromas and reduced irritancy. These chemical and sensory outcomes are distinct from reciprocal microbial fitness and from direct measurements of the upstream degradation processes.
Evidence
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doi:10.1016/j.indcrop.2025.122621 - SUPPORT (IN_VITRO)"Metabolomic profiling identified 31 differentially accumulated volatile flavor compounds"
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doi:10.1016/j.indcrop.2025.122621 - SUPPORT (IN_VITRO)"phenylacetic acid, phytol, and farnesol, which were upregulated in the BsBv group and contributed to enhanced honey, floral, and baked aromas, while reducing irritancy."
Knowledge gaps & discussions (1)
KNOWLEDGE_GAP OPEN Which components of the BsBv-associated fermentation response mediate the volatile and sensory outcomes?
Keep the positive degradation, community and flavor observations and the source path-model hypothesis. The reviewed abstract does not isolate substrate conversion or Bacillus enrichment as the causal mediator. Reciprocal bacterial benefit and spatial or temporal niche separation are not established.
Attaches to: ecological_interactions#Macromolecule degradation after BsBv inoculation, ecological_interactions#SynCom-driven bacterial community succession and Bacillus enrichment, ecological_interactions#Volatile flavor and sensory-quality outcomes
1 evidence item(s)
indirectly improved sensory quality by mediating shifts in microbial β-diversity
Reports the authors statistical mediation interpretation, not an experimentally isolated taxon effect.
Growth Media
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